Thinking more...

First, I try to surf in internet. Fortunately, I read an artile: Making DVD in Linux in Digg.
In this artile, the author share his experience and DVD styler.

After I tried, DVD styler cannot work in Ubuntu (Edgy).
So I give up DVD styler.

And again, I beg Google, I wish he can give me the answer.
Google tell me, there is already a good package: DeVeDe in Ubuntu (Edgy).

Installation:

sudo apt-get install devede vcdimager mencoder mplayer w32codecs dvdauthor gnomebaker

Usage:

1. Enter Application > Music and Video, click DeVeDe。
2. Click "Video DVD".
3. Below the right list, there is a button "Add". After you click it, another dialog will pop up. You can select the video, set video size, Scaling, Output video format and etc.
4. After added, the below indicator will show you how many disk space you use. According my experience, the DVD ISO is about 2.1G after filling up with videos. Click "Next", DeVeDe will begin to encoding videos and building DVD ISO.
5. Finally, use GnomeBaker to burn the ISO.

After I tried to play the DVD in my DVD player, it really works!!

Screenshot：